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Preparation method of nano-silver

A technology of nano-silver and silver-ammonia solution, applied in the field of nano-materials, to achieve the effect of preventing further growth and agglomeration, mild reaction and simple process

Inactive Publication Date: 2015-01-07
钱景
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But also do not see that the drink that can sell on the market is directly used in preparing nano-silver

Method used

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  • Preparation method of nano-silver

Examples

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Embodiment 1

[0021] Mix 20ml of oriental leaf green tea original flavor tea drink (manufactured by Nongfu Spring Co., Ltd., tea polyphenol content greater than or equal to 360mg / kg) with 1ml of silver ammonia solution with a mass fraction of 5g / L, and ultrasonicate for 2h at a temperature of 20°C , to obtain a nano-silver colloidal solution, washed repeatedly with ethanol and deionized water, centrifuged at a speed of 9000r / min for 10min, and dried under vacuum at 40°C for 20h to obtain nano-silver.

[0022] figure 1 It is the SEM picture of the nano silver prepared in this embodiment, as can be seen from the figure, the nano silver is spherical, and the distribution is uniform, and the average particle size is about 20nm.

[0023] figure 2 It is the XRD diffraction pattern of the nano-silver prepared in this example, and there are 4 obvious characteristic peaks at 38.00°, 44.26°, 64.40°, and 77.32°, indicating that nano-silver is generated in the solution. .

Embodiment 2

[0025] Mix 50ml of Huiyuan orange juice (manufactured by Huiyuan Group Co., Ltd.) with 1ml of silver-ammonia solution with a mass fraction of 1g / L, sonicate at 20°C for 1h to obtain a nano-silver colloid solution, and wash it repeatedly with ethanol and deionized water , centrifuged at 8000r / min for 10min, and dried under vacuum at 40°C for 24h to obtain silver nanoparticles.

Embodiment 3

[0027] Mix 10ml of Minute Maid orange (produced by Coca-Cola) with 1ml of silver ammonia solution with a mass fraction of 10g / L, and ultrasonicate at 40°C for 5h to obtain a nano-silver colloid solution, and use ethanol and deionized water Repeated washing, centrifugation at 10,000 r / min for 15 min, and drying under vacuum at 40° C. for 4 h to obtain silver nanoparticles.

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Abstract

The invention relates to a preparation method of nano-silver. The preparation method comprises the following steps: mixing drinks available in the market with silver-ammonia solution with a mass fraction of 0.01-100 g / L according to a volume ratio of 100:1 to 1:1; performing ultrasonic treatment for 1-10 hours under the temperature condition of 20-60 DEG C to obtain nano-silver colloidal solution; repeatedly cleaning with ethanol and de-ionized water; centrifuging; drying to obtain the nano-silver. The juice type drinks and tea type drinks available in the market are directly used as a reducing agent and a stabilizing agent without a complex plant and peel active matter extraction process; the method has the advantages of simple process, wide raw material source, mild reaction, environment friendliness and the like.

Description

technical field [0001] The invention belongs to the field of nanometer materials, in particular to a preparation method of nanometer silver. Background technique [0002] Nano-silver has excellent heat transfer, electrical conductivity, surface activity and catalytic properties, and has great application value in the fields of optics, catalysis, microelectronics, biosensing, and antibacterial. The traditional preparation of nano-silver is divided into physical method and chemical method. The physical method has higher requirements on instruments and equipment, and the production cost is expensive. Chemical methods often use hydrazine hydrate, formaldehyde, polyols, organic amines, etc. as reducing agents. Although these reducing agents have high activity, they are harmful to the environment, and the prepared nano-silver is prone to agglomeration. [0003] In recent years, the preparation of nano-silver by green, environmentally friendly, efficient and cheap methods has gra...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 钱景赵兵
Owner 钱景
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